First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region

G Christiaens^{1

2}, M Defurne¹, D Sokhan^{1

2}, P Achenbach³, Z Akbar⁴, M J Amaryan⁵, H Atac⁶, H Avakian³, C Ayerbe Gayoso⁷, L Baashen⁸, N A Baltzell³, L Barion⁹, M Bashkanov¹⁰, M Battaglieri¹¹, I Bedlinskiy¹², B Benkel¹³, F Benmokhtar¹⁴, A Bianconi^{15

16}, A S Biselli¹⁷, M Bondi¹⁸, W A Booth¹⁰, F Bossù¹, S Boiarinov³, K-Th Brinkmann¹⁹, W J Briscoe²⁰, S Bueltmann⁵, D Bulumulla⁵, V D Burkert³, T Cao³, D S Carman³, J C Carvajal⁸, A Celentano¹¹, P Chatagnon²¹, V Chesnokov²², T Chetry^{8

23

24}, G Ciullo^{9

25}, G Clash¹⁰, P L Cole^{3

26

27}, M Contalbrigo⁹, G Costantini^{15

16}, A D'Angelo^{18

28}, N Dashyan²⁹, R De Vita¹¹, A Deur³, S Diehl^{19

30}, C Dilks³¹, C Djalali^{24

32}, R Dupre²¹, H Egiyan³, M Ehrhart²¹, A El Alaoui¹³, L El Fassi²³, L Elouadrhiri³, S Fegan¹⁰, A Filippi³³, K Gates², G Gavalian³, Y Ghandilyan²⁹, G P Gilfoyle³⁴, F X Girod³, D I Glazier², A A Golubenko²², G Gosta¹⁵, R W Gothe³², Y Gotra³, K A Griffioen⁷, M Guidal²¹, K Hafidi³⁵, H Hakobyan¹³, M Hattawy^{5

35}, F Hauenstein^{3

5}, T B Hayward³⁰, D Heddle^{3

36}, A Hobart²¹, D E Holmberg⁷, M Holtrop³⁷, Y Ilieva³², D G Ireland², E L Isupov²², H S Jo³⁸, D Keller⁴, M Khachatryan⁵, A Khanal⁸, W Kim³⁸, A Kripko¹⁹, V Kubarovsky³, S E Kuhn⁵, V Lagerquist⁵, L Lanza¹⁸, M L Kabir²³, M Leali^{15

16}, S Lee³⁹, P Lenisa^{9

25}, X Li³⁹, K Livingston², I J D MacGregor², D Marchand²¹, V Mascagna^{15

16

40}, G Matousek³¹, B McKinnon², C McLauchlin³², Z E Meziani^{6

35}, S Migliorati^{15

16}, R G Milner³⁹, T Mineeva¹³, M Mirazita⁴¹, V Mokeev³, E Molina¹³, C Munoz Camacho²¹, P Nadel-Turonski³, P Naidoo², K Neupane³², S Niccolai²¹, M Nicol¹⁰, G Niculescu⁴², M Osipenko¹¹, M Ouillon²¹, P Pandey⁵, M Paolone^{6

43}, L L Pappalardo^{9

25}, R Paremuzyan^{3

37}, E Pasyuk³, S J Paul⁴⁴, W Phelps^{20

36}, N Pilleux²¹, M Pokhrel⁵, J Poudel⁵, J W Price⁴⁵, Y Prok⁵, A Radic¹³, N Ramasubramanian¹, B A Raue⁸, Trevor Reed⁸, J Richards³⁰, M Ripani¹¹, J Ritman^{46

47}, P Rossi^{3

41}, F Sabatié¹, C Salgado⁴⁸, S Schadmand^{46

47}, A Schmidt^{20

39}, M B C Scott³⁵, Y G Sharabian³, E V Shirokov²², U Shrestha^{24

30}, P Simmerling³⁰, N Sparveris⁶, M Spreafico¹¹, S Stepanyan³, I I Strakovsky²⁰, S Strauch³², J A Tan³⁸, N Trotta³⁰, M Turisini⁴¹, R Tyson², M Ungaro³, S Vallarino⁹, L Venturelli^{15

16}, H Voskanyan²⁹, E Voutier²¹, D P Watts¹⁰, X Wei³, R Williams¹⁰, R Wishart², M H Wood⁴⁹, N Zachariou¹⁰, J Zhang⁴, Z W Zhao^{5

31}, V Ziegler³, M Zurek³⁵; CLAS Collaboration

Affiliations

¹ IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
² University of Glasgow, Glasgow G12 8QQ, United Kingdom.
³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁴ University of Virginia, Charlottesville, Virginia 22901, USA.
⁵ Old Dominion University, Norfolk, Virginia 23529, USA.
⁶ Temple University, Philadelphia, Pennsylvania 19122, USA.
⁷ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
⁸ Florida International University, Miami, Florida 33199, USA.
⁹ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹⁰ University of York, York YO10 5DD, United Kingdom.
¹¹ INFN, Sezione di Genova, 16146 Genova, Italy.
¹² National Research Centre Kurchatov Institute-ITEP, Moscow, 117259, Russia.
¹³ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
¹⁴ Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
¹⁵ Universit'a degli Studi di Brescia, 25123 Brescia, Italy.
¹⁶ INFN, Sezione di Pavia, 27100 Pavia, Italy.
¹⁷ Fairfield University, Fairfield, Connecticut 06824, USA.
¹⁸ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
¹⁹ II Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany.
²⁰ The George Washington University, Washington, D.C. 20052, USA.
²¹ Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
²² Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
²³ Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
²⁴ Ohio University, Athens, Ohio 45701, USA.
²⁵ Universita' di Ferrara, 44121 Ferrara, Italy.
²⁶ Lamar University, 4400 MLK Boulevard, P.O. Box 10046, Beaumont, Texas 77710, USA.
²⁷ Catholic University of America, Washington, D.C. 20064, USA.
²⁸ Universita' di Roma Tor Vergata, 00133 Rome, Italy.
²⁹ Yerevan Physics Institute, 375036 Yerevan, Armenia.
³⁰ University of Connecticut, Storrs, Connecticut 06269, USA.
³¹ Duke University, Durham, North Carolina 27708-0305, USA.
³² University of South Carolina, Columbia, South Carolina 29208, USA.
³³ INFN, Sezione di Torino, 10125 Torino, Italy.
³⁴ University of Richmond, Richmond, Virginia 23173, USA.
³⁵ Argonne National Laboratory, Argonne, Illinois 60439, USA.
³⁶ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁷ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁸ Kyungpook National University, Daegu 41566, Republic of Korea.
³⁹ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.
⁴⁰ Università degli Studi dell'Insubria, 22100 Como, Italy.
⁴¹ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
⁴² James Madison University, Harrisonburg, Virginia 22807, USA.
⁴³ New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003, USA.
⁴⁴ University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
⁴⁵ California State University, Dominguez Hills, Carson, California 90747, USA.
⁴⁶ GSI Helmholtzzentrum fur Schwerionenforschung GmbH, D 64291 Darmstadt, Germany.
⁴⁷ Institute fur Kernphysik (Juelich), 52428 Juelich, Germany.
⁴⁸ Norfolk State University, Norfolk, Virginia 23504, USA.
⁴⁹ Canisius College, Buffalo, New York 14208, USA.

PMID: 37295113
DOI: 10.1103/PhysRevLett.130.211902

First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region

G Christiaens et al. Phys Rev Lett. 2023.

. 2023 May 26;130(21):211902.

doi: 10.1103/PhysRevLett.130.211902.

Authors

Affiliations

¹ IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
² University of Glasgow, Glasgow G12 8QQ, United Kingdom.
³ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁴ University of Virginia, Charlottesville, Virginia 22901, USA.
⁵ Old Dominion University, Norfolk, Virginia 23529, USA.
⁶ Temple University, Philadelphia, Pennsylvania 19122, USA.
⁷ College of William and Mary, Williamsburg, Virginia 23187-8795, USA.
⁸ Florida International University, Miami, Florida 33199, USA.
⁹ INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
¹⁰ University of York, York YO10 5DD, United Kingdom.
¹¹ INFN, Sezione di Genova, 16146 Genova, Italy.
¹² National Research Centre Kurchatov Institute-ITEP, Moscow, 117259, Russia.
¹³ Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile.
¹⁴ Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
¹⁵ Universit'a degli Studi di Brescia, 25123 Brescia, Italy.
¹⁶ INFN, Sezione di Pavia, 27100 Pavia, Italy.
¹⁷ Fairfield University, Fairfield, Connecticut 06824, USA.
¹⁸ INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.
¹⁹ II Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany.
²⁰ The George Washington University, Washington, D.C. 20052, USA.
²¹ Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
²² Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119234 Moscow, Russia.
²³ Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
²⁴ Ohio University, Athens, Ohio 45701, USA.
²⁵ Universita' di Ferrara, 44121 Ferrara, Italy.
²⁶ Lamar University, 4400 MLK Boulevard, P.O. Box 10046, Beaumont, Texas 77710, USA.
²⁷ Catholic University of America, Washington, D.C. 20064, USA.
²⁸ Universita' di Roma Tor Vergata, 00133 Rome, Italy.
²⁹ Yerevan Physics Institute, 375036 Yerevan, Armenia.
³⁰ University of Connecticut, Storrs, Connecticut 06269, USA.
³¹ Duke University, Durham, North Carolina 27708-0305, USA.
³² University of South Carolina, Columbia, South Carolina 29208, USA.
³³ INFN, Sezione di Torino, 10125 Torino, Italy.
³⁴ University of Richmond, Richmond, Virginia 23173, USA.
³⁵ Argonne National Laboratory, Argonne, Illinois 60439, USA.
³⁶ Christopher Newport University, Newport News, Virginia 23606, USA.
³⁷ University of New Hampshire, Durham, New Hampshire 03824-3568, USA.
³⁸ Kyungpook National University, Daegu 41566, Republic of Korea.
³⁹ Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.
⁴⁰ Università degli Studi dell'Insubria, 22100 Como, Italy.
⁴¹ INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
⁴² James Madison University, Harrisonburg, Virginia 22807, USA.
⁴³ New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico 88003, USA.
⁴⁴ University of California Riverside, 900 University Avenue, Riverside, California 92521, USA.
⁴⁵ California State University, Dominguez Hills, Carson, California 90747, USA.
⁴⁶ GSI Helmholtzzentrum fur Schwerionenforschung GmbH, D 64291 Darmstadt, Germany.
⁴⁷ Institute fur Kernphysik (Juelich), 52428 Juelich, Germany.
⁴⁸ Norfolk State University, Norfolk, Virginia 23504, USA.
⁴⁹ Canisius College, Buffalo, New York 14208, USA.

PMID: 37295113
DOI: 10.1103/PhysRevLett.130.211902

Abstract

Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions describing the 3D structure of the nucleon. We report the first measurement of the DVCS beam-spin asymmetry using the CLAS12 spectrometer with a 10.2 and 10.6 GeV electron beam scattering from unpolarized protons. The results greatly extend the Q^{2} and Bjorken-x phase space beyond the existing data in the valence region and provide 1600 new data points measured with unprecedented statistical uncertainty, setting new, tight constraints for future phenomenological studies.

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First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region

Affiliations

First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region

Authors

Affiliations

Abstract